Glass filter and method of making it



May 30, 1939.

H. c. BA'rEs GLAS S FILTER AND METHOD OF MAKING I T Filed May 28. 1956 IINVENTOR- /%4RRY C 8HTES ATTORNEYS.

Patented May 30, 1939- i I UNITED STATES PATENT oFFlcr-z GLASS FILTERAND METHOD OF MAKING IT Harry Cliflord Bates, Corning, N. Y., assignorto Corning Glass Works, Corning, N. Y., a cor'po-. ration of New YorkApplication May 28, 1936, Serial No. 82,341 3 Claims. (01. 210-112) Thisinvention relates to the refining of liquids, with a raised centerportion. Extending downand more particularly to the filtering of liquidswardly therefrom and connecting with a base such as the various acid andchemical solutions 15 is a wall iii of approximately the samethickcommonly employed in industry. Y ness as the base l5 and the raisedportion i4.

In the process of refining chemical containin By examination of thedrawing and particu- 5 solutions it is imperative that a device used forlarly the cross-sectional view of the filter plate such purpose, beconstructed of materials -re- 13, as shown in Fig. 1, it becomes obviousthat as sistantto attack by the liquid being filtered. sufficient liquidis poured into the receptacle to In the manufacture of such devices,glass has completely cover the filter plate l3, filtration will longbeen accepted as a most practical material, occur thr u h the r is dport n H, h ba l5 10 both from the standpoint of economy and beand thewall l6. It will also b Seen hat by cause of its chemically resistant,rop rti increasing or decreasing the height of the wall The object of myinvention is to render liquids IS the rate of filtration may becorrespondingly free from contamination by foreign substances. d. r

such as cement compounds often used in the con- As previously mentioned,the fllt r'plate i8 is 16 tion f glass'filters to bond the granularseated on a ground contacting surface I2 of the members of the filteringplate and to hold the holl w l y n this connection i w ll plate in thebody of the filter. be noted that while the wall [6 of the raised Afurther object is the rapid filtering of chemn er po i n l4 providesadded filtering r i ieal solutions and the like in a receptacle imitalso providesa convenient surface for seizure 20 pervious to acidattack. by a chuck or other suitable mechanical device My inventionembodie among it features a, used to eiiect the rotation of plate l3 ingrindhollow glass body having a constricted lower ing i into Seat aportion, the inner face of which is tapered to n the a te n ive fo o t ive n. 11-

provide a seat for a similarly tapered filter plate lustrated in Fig. te Outer y i7 i8 Spherical said filter plate and its cooperating seathaving in shape, while the filtering element I8 is showngroundcontacting surfaces to produce 9, subin the form of a thimble. In thisconstruction stantially leak-tight joint. I it is evident that the domeshape of the upper A further feature i a filter plate having end of thethimble l8 provides a much greater 3o relatively large filteringsurface, compared to filtering a h Pr d y the sual flat its diameterrand so shaped as to facilitate .the t pe of fi ter u t a at the sametime so p ogrinding of the filter plate in lac against t vides asuitable surface for seizure by a chuck. seat during the process ofmanufacture. While Ihave shown and described the preferred My inventionis illustrated in the accompanyembodiments of my invention, it is to'beundera ing drawing in which, stood that I do not wish to limit suchinvention 5 Fig. l is an elevation, partly in section, showto theparticular forms shown in the drawing ing the preferred construction ofmy invention; and that minor changes in detail may be re- 7 Fig. 2 is aperspective view of the filter plate sorted to without departing fromthe spirit and h wni d scope of the invention as claimed. .Flg. 3 is afragmentary section showing an al- 1 1 v J temative of construction of mfiltering 1. In a filter assembly suitable for use in filterdevice. ingacids and like corrosion liquids,'a hollow glass li'efernng to thedrawing in detailand P body for receiving fluids to be filtered, ahollow ticul y to Fi e un haped r cep glass filter element of porousmaterial having a genera y des III, a e er y contapered wall through themedium or which it Structed 0f 5 is Provided with a constricted issupported on a tapered wall portion of said lower portion II, the innerface of which is sufbody and an upwardly extended hollow, ti ficie ytapered to P de a Seat 42 for the supof said element which increases"its filtering sur- D Of a Similarly p i D S filter plate face andalsoserves as a portion of the element n lly designated 3- Th s fi t p te sprefwhich'may be seized to enable grinding of the 5 erably constmfitedSintered the manutapered wall surfaces to obtain a fluid tight fitfacture of which is well known and briefly conbetween them. q Y

5; sists of applying sufilcient. heat to fine glass par- 2. A porousfilter unit suitable for filtering acids ticles tocause partial fusionand cohesion. and like corrosive liquids consisting of two up-The'fl'iter plate |3'(Figs. 1 and 2) is provided standing cylindricalwall portions composed of g glass arranged concentrically with theircorresponding ends integral with a flat bottom portion, the oppositelydisposed end of the inner of such cylinders being integral 'withla fiatclosed portion, and the exterior wall surface of the outer of saidcylinders being tapered so as to serve as a supporting surface for theunit. 7

3. In a-filter 1y suitable for filtering acids HARRY crm'onn mm.

